MASS TRANSFER

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This book was developed by Professor S. Mostafa Ghiaasiaan during 10 years of teaching a graduate-level course on convection heat and mass transfer. The book is ideal for a graduate course dealing with theory and practice of convection heat and mass transfer. The book treats well-established theory and practice on the one hand; on the other hand, it is enriched by modern areas such as flow in microchannels and computational fluid dynamics–based design and analysis methods. The book is primarily concerned with convective heat transfer. Essentials of mass transfer are also covered. The mass transfer material and problems are presented such that they can be easily skipped, should that be preferred. The book is richly enhanced by exercises and end-of-chapter problems. Solutions are available for qualified instructors. The book includes 17 appendices providing compilations of most essential properties and mathematical information for analysis of convective heat and mass transfer processes.

Experiments have been conducted for natural convection heat transfer from protruding discrete heat sources, mounted at different positions on a substrate, to determine the optimal configuration, and to study the effect of surface radiation on them, which reduces their temperature upto 12 %. The optimal configuration has been determined by a non-dimensional geometric distance parameter (k). An empirical correlation has been proposed between the non-dimensional steady state temperature (h) and k, by taking into account the effect of surface radiation heat transfer.

2010

During the freezing process by fluidization the heat and mass transfer varies, the different parts of the product being in various stages of cooling. The freezing speed influences the heat and mass transfer, and the mechanism of forming the ice crystals respectively and, in the end, the quality of the frozen product destined to consumption.

• One of the most common applications of heat transfer is to design equipment for exchanging heat from one fluid to another. Such devices are generally called Heat Exchangers. Because there are many important applications, heat exchanger research and development has had a long history. Such activity is by no means complete, however as many talented workers continue to seek ways of improving deign and performance. • From the view point of energy conservation and space constraint, there has been a steady and substantial increase in research activity. a focal point for this work has been heat transfer enhancement, which includes the search for special heat exchanger surfaces through which enhancement may be achieved. In this chapter we have attempted to develop tools that will allow you to perform approximate heat exchanger calculations. • Although we have restricted ourselves to heat exchangers involving separation of hot and cold fluids by stationary walls, there are other important options. for example, evaporative heat exchangers enable direct contact between liquid and gas and because of latent energy effects, large heat transfer rates per unit volume are possible. • Also for gas-togas heat exchange, use is often made of regenerators in which the same space is alternately occupied by hot and cold gases. In a fixed regenerator such as a packed bed, the hot and cold gases alternately enter a stationary, porous solid in a rotary regenerator, the porous solid is a rotation wheel, which alternately exposes its surfaces to the continuously flowing hot and cold gases.

Nuclear Engineering and Design, 2006

The paper is focused on some of the different forms of the analogy between heat and mass transfer, as they appear in available textbooks and literature on condensation and evaporation. The motivation for the work is the need to clearly point out the assumptions at the basis of each one of them and to quantify the related differences in the application to real experimental data. In fact, the analogy is very often cast in apparently very different forms, whose relation to each other must be carefully understood when a selection among them is performed for a given application.